Render Failure - Image is smokey
first of all, in the archive you've sent i haven't found any portals.. to set them properly you shoud get an area lamp and not a sun one.

like this:

second, i recommend you to reduce the light bounces, its better for performance and i think it may help with some of the noise:



the denoiser effect may be too strong, i'd leave it in the default settings, besides 8 radius costs a lot of performance..

A big part of the problem can be because there is too many light sources.. i don't know how you could fix this.. but from what i already said im pretty sure you'll get better results